Compression tray



H. M. CARROLL, SR. COMPRESSION TRAY.

APPLICATION FILED DEC-5,1921.

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Patented Jan. 24, 1922.

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Application filed December 5, 1921.

To all whom it may concern Be it known that I, HOUSTON M. CARROLL, Sn, acitizen of the United States, residing at San Antonio, in the county ofBexar and State of Texas, have invented a new and useful CompressionTray, of which the following is a specification.

As it is well understood by persons skilled in the art, plaster ofParis, contained in an impression cup is frequently used for takingimpressions of the human mouth, in connec tion with the operation offashioning artificial teeth. Further, it is well known that the palatinearch is much harder and unyielding than is the alveolar ridge. Theresult is that when a bite is taken on a mass of plaster of Paris, orthe like, in an impression tray, the water is pressed out of the centralportion of the mass, by the relatively hard palatine arch, and flows tothe ed es of the tray, thereby softening the material in which theimpression of the alveolar ridge is received. The unsatisfactory resultsflowing from the foregoing operation will be appreciated readily.

In view of the foregoing, this invention aims, broadly considered, toprovide an impression tray, the central portion of which is moreyielding than is the peripheral portion thereof, to the end that thepalatine arch may not compress the water out of the mixture, therebysoftening that portion of the mixture wherein the impression of thealveolar ridge is received.

Itis within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the inventionappertains.

In the accompanying drawings:

Figure 1 shows in top plan, a tray constructed in accordance with theinvention; Figure 2 is a bottom plan of the tray Figure 3 is a sectionon the line 33 of Figure 1; Figure 4 is a section on the line 44 ofFigure 1; and Figure 5 is an enlarged section on the line 55 of Figure1.

In carrying out the invention, there is provided a main member 1 whichmay be made of metal or any other relatively rigid substance, the mainmember including a base 2 having an opening 3, the main member beingsupplied with an upstanding marginal Specification of Letters Patent.

Patented Jan. 24, 1922.

Serial No. 520,037.

flange 4. The numeral 5 denotes an auxiliary member, made of metal orsome other relatively. rigid substance, and having an opening 6,regisering approximately at least, with the opening 3 in the main member1, the auxiliary member being prolonged to form a handle 7 provided withan opening 8 whereby the tray may be suspended when not in use. Theauxiliary member 5 corresponds approximately in shape to the base 2 ofthe main member 1 and is placed therebeneath.

A yieldable and preferably resilient diaphragm 9 is located between thebase 2 of the main member 1 and the auxiliary member 5. The diaphragm 9may be made of rubber or any other suitable material having the physicalcharacteristics above alluded to. Securing elements 10 connect theauxiliary member 5 with the main member 1 and hold the diaphragm 9 inplace. The securing elements 10 preferably are removable, to the endthat the diaphragm 9 may be renewed, and, if preferred, screws may beused.

When a bite is taken, that portion of the impression material which iscompressed by the relatively hard palatine arch will cause the diaphragm9 to yield, practically none of the water being squeezed out of theimpres sion material to moisten or liquefy that portion of theimpression material which receives the impression of the alveolar ridge.The impression material retains its homogeneity, and the clearness ofthe impression is preserved, especially as regards the alveolar ridge.

What is claimed is:

1. A dental impression tray embodying a. marginal portion, and an innerportion which is more yielding than the marginal portion.

2. A dental impression tray comprising a main member having an opening;and a yieldable diaphragm secured to the main member and extended acrossthe opening.

3. A dental impression tray comprising main and auxiliary members havingregistering openings; and a yieldable diaphragm held between saidmembers and extended across the'openings.

4. A dental impression tray comprising main and auxiliary members havingregis- I tering openings, the auxiliary member being In testimony that Icleim the foregoing prolonged to form a handle for the tray; a as myOWI1,-I have hereto 'afiixed my signayieldable diaphragm located betweenthe tune 1n the resence of twp itnesses. 7 main and auxiliary members:and extended H iUSTON 1W; CARROLL; f SRi across the openings; and meansfer connect- WitneSses'i ing the main and auxiliary members releas- J P.OLDHAM, M. D.,

ably, to retain the-diaphragm. HERMAN IVL-CAR OEL.

